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Questions and Answers
What is another name for Newton's First Law of Motion?
What is another name for Newton's First Law of Motion?
- Law of Gravitation
- Law of Inertia (correct)
- Law of Action-Reaction
- Law of Acceleration
Which property of an object resists a change in its state of motion?
Which property of an object resists a change in its state of motion?
- Density
- Acceleration
- Inertia (correct)
- Velocity
According to Newton's First Law, what happens to an object at rest when no external force acts on it?
According to Newton's First Law, what happens to an object at rest when no external force acts on it?
- It decelerates
- It moves with constant velocity
- It remains at rest (correct)
- It accelerates
Which type of motion does Inertia apply to?
Which type of motion does Inertia apply to?
What is required to change the motion of a more massive object?
What is required to change the motion of a more massive object?
If all the forces acting on an object are equal, what is the overall effect on the object's motion?
If all the forces acting on an object are equal, what is the overall effect on the object's motion?
When a car's brakes are applied, what kind of force is acting on the car?
When a car's brakes are applied, what kind of force is acting on the car?
What must be true for Newton's First Law to be relevant to an object?
What must be true for Newton's First Law to be relevant to an object?
Why does a skater spin when performing a spin?
Why does a skater spin when performing a spin?
If no external force acts upon an object in motion, what will happen?
If no external force acts upon an object in motion, what will happen?
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Study Notes
Newton's First Law of Motion
Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest tends to stay at rest, and an object in motion tends to stay in motion with a constant velocity, unless acted upon by an external force. This law is based on the principle that objects do not change their state of motion unless an unbalanced force acts upon them.
Inertia
Inertia is the property of an object that resists a change in its state of motion. It is directly related to an object's mass. The more massive an object is, the more inertia it has and the more force is required to change its motion. Inertia applies to both translational motion (motion along a straight line) and rotational motion (spinning or rotating around an axis).
Unbalanced Force
For Newton's First Law to apply, an object must be under the influence of only balanced forces, which means the sum of all the forces acting on an object is equal to zero. If an unbalanced force acts on an object, it will change the object's state of motion.
Applications
Newton's First Law has practical applications in various aspects of our lives. For example, when a car's brakes are applied, the car's motion is changed because an unbalanced force is applied to the car, causing the wheels to slow down. Similarly, when a skater performs a spin, they apply an unbalanced force in a particular direction, causing them to spin around that axis.
Newton's First Law also explains why objects on Earth remain in their position unless acted upon by an external force. For instance, a book resting on a table will not move unless someone exerts an external force on it, such as pushing it.
In summary, Newton's First Law of Motion, or the Law of Inertia, is a fundamental principle in physics that describes the tendency of objects to maintain their state of motion unless acted upon by an external force. It is a cornerstone of classical mechanics and has wide-ranging applications in various fields of science and engineering.
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